60% Vespel / 40% Graphite ferrules have an upper temperature limit of 400 deg. C. Ferrule is for standard 1/16 in. Swagelok / Parker type fitting. 0.4 mm ID fits 0.25 mm ID capillary columns.Packaged: 3 in. x 3 in. x 1/4 in. Plastic Dial Pack; Weight: 5.7 g.